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Agreement and Plan of Merger (Narrative) (Details) - Riverview - USD ($)		3 Months Ended		9 Months Ended
	Jun. 30, 2021	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Business Acquisition [Line Items]
Ratio of conversion of acquiree's shares to entity's shares	48.33%
Merger-related expenses		$ 198,000	$ 0	$ 720,000	$ 0

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- Definition

Ratio of entity's shares to a single share acquiree.

+ References

No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

The amount of cash paid during the reporting period for charges associated with the mergers.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 25
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3536-108585

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